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Honda Fit/Jazz - DTC Troubleshooting: P0112 (10) (With ETCS)

Online Honda Fit/Jazz 2002-2005 Workshop repair manual used by professionals.

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DTC Troubleshooting: P0112 (10)

DTC P0112: IAT Sensor Circuit Low Voltage


1.Turn the ignition switch ON (II).

2.Check the IAT SENSOR in the DATA LIST with the HDS.

Is about 140°C (284°F) or higher, or 0.14 V or less indicated?


YES - Go to 3.


NO - Intermittent failure, system is OK at this time.Check for poor connections or loose terminals at the IAT sensor and the ECM.n


3.Turn the ignition switch OFF.

4.Disconnect the IAT/MAP sensor 4P connector.

5.Turn the ignition switch ON (II).

6.Check the IAT SENSOR in the DATA LIST with the HDS.

Is about 140°C (284°F) or higher, or 0.14 V or less indicated?


YES - Go to 7.


NO - Go to 10.


7.Turn the ignition switch OFF, and wait 10 seconds.

8.Disconnect ECM connector No. 3 (52P).

9.Check for continuity between IAT/MAP sensor 4P connector terminal No. 3 and body ground.

IMAGE REPLACED HERE

Is there continuity?


YES - Repair short in the wire between the ECM connector No. 3 terminal No. 51 (test pin box terminal No. 80) and the MAP sensor, then go to 12.


NO - Go to 17.


10.Turn the ignition switch OFF.

Replace the IAT/MAP sensor.

12.Reconnect all connectors.

13.Turn the ignition switch ON (II).

14.Do the ECM RESET in the CLEAR MENU with the HDS.

15.Do the ETCS learn procedure.

16.Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0112 is indicated, check for poor connections or loose terminals at the IAT sensor and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.


NO - Troubleshooting is complete.n


17.Substitute a known-good ECM.

18.Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0112 is indicated, check for poor connections or loose terminals at the IAT sensor and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.


NO - Replace the original ECM.n

(284°F) or


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